The Engineer Tools — Free Online Engineering Platform for Oil, Gas and Mechanical Engineers

The Engineer Tools is a free browser-based engineering platform with 11 professional simulation and calculation tools for petroleum, production, reservoir and mechanical engineering. All tools run entirely in the browser — no installation, no registration required. Built on industry-standard correlations used in real field operations worldwide.

IPR/VLP Nodal Analysis — Inflow Performance and Tubing Performance

Calculate the inflow performance relationship (IPR) and vertical lift performance (VLP) for oil and gas wells. Available IPR models: Vogel (saturated reservoirs), Darcy (single-phase, linear flow), Fetkovich (pseudo-steady state), Standing (modified Vogel with skin), and Composite IPR (above and below bubble point). VLP correlations: Beggs & Brill (1973), Hagedorn-Brown, Gray, and Simplified gradient. Find the operating point (intersection of IPR and VLP curves), size choke beans, perform sensitivity analysis on skin factor, tubing diameter, and wellhead pressure. Ideal for well performance optimization, production optimization, and artificial lift design.

PVT Calculator — Pressure Volume Temperature Correlations for Oil and Gas

Compute PVT properties for black oil and gas condensate systems. Correlations included: bubble point pressure (Standing 1947), solution gas-oil ratio Rs (Standing), oil formation volume factor Bo (Vasquez-Beggs 1980), gas deviation factor Z (Hall-Yarborough iterative Newton-Raphson, Papay explicit), gas correction for H2S and CO2 (Wichert-Aziz), dead oil viscosity (Beal correlation), live oil viscosity (Beggs-Robinson 1975), gas FVF Bg, gas viscosity (Lee-Gonzalez-Eakin). Campbell fluid classification (dry gas, wet gas, gas condensate, volatile oil, black oil). Export results to CSV or PDF.

Material Balance Equation — Havlena-Odeh Reservoir Analysis

Reservoir material balance using the Havlena-Odeh (1963) linearization method. Calculate original oil in place (OOIP) and original gas in place (OGIP) by linear regression. Quantify drive mechanism indices: solution gas drive (expansion of dissolved gas), gas cap drive (free gas expansion), water drive (aquifer influx), compressibility of rock and connate water (Efw). Compute expansion terms Eo (oil expansion), Eg (gas cap expansion), Efw (formation and water expansion). Detects unmodeled water influx from regression intercept. PVT correlations: Standing Rs, Vasquez-Beggs Bo, Hall-Yarborough Z-factor. Supports manual PVT input or auto-calculated from correlations.

Decline Curve Analysis — Arps Exponential Hyperbolic Harmonic

Production decline analysis using Arps (1945) models for oil and gas wells. Calculate initial decline rate Di, b-factor (hyperbolic exponent), estimated ultimate recovery (EUR), remaining reserves, abandonment rate, and economic life of the well. Models: exponential decline (b=0), hyperbolic decline (0 less than b less than 1), harmonic decline (b=1). Regression fitting to historical production data. Generate production forecast for 1, 5, 10, 20 years. Used in reserves estimation (1P, 2P, 3P), SEC filings, and production forecasting.

ESP and BES Electric Submersible Pump Design

Design and selection tool for electric submersible pumps (ESP), also known as bombas electrosumergibles (BES) in Spanish. Calculate total dynamic head (TDH), pump intake pressure (PIP), pump stages selection, motor sizing (HP/kW), cable length and gauge selection, operating point on pump curve, efficiency at operating point. Evaluate system performance under different flow rates, GLR (gas-liquid ratio), and casing pressure conditions. Critical for artificial lift design in oil wells with high water cut or insufficient reservoir energy.

Multiphase Pressure Drop and Friction Losses — Beggs and Brill Pipeline Calculator

Calculate pressure drop and friction losses in oil and gas tubing and pipelines using the Beggs and Brill (1973) multiphase flow correlation. Determines flow regime (segregated: stratified smooth and wavy, intermittent: slug and plug, distributed: bubble and mist), liquid holdup HL, friction pressure gradient, gravitational pressure gradient, and total pressure gradient. Also Darcy-Weisbach equation for single-phase liquid and gas flow: friction factor (Moody chart, Colebrook-White iteration, explicit Swamee-Jain approximation), Reynolds number, flow velocity, pressure loss in straight pipe and fittings (K-factor method). Friction losses in pipelines. Pressure losses in tubing. Used for pipeline design, separator sizing, and tubing string optimization.

Gas Compressor Sizing — Centrifugal and Reciprocating

Natural gas compressor design and performance calculator for centrifugal and reciprocating compressors. Input: suction pressure, discharge pressure, flow rate (MMSCFD), gas specific gravity, temperature, Z-factors. Output: compression ratio (CR), polytropic head (Hp), adiabatic head, isentropic efficiency, brake horsepower (BHP), gas horsepower (GHP), number of stages for multi-stage compression, discharge temperature, intercooler duty. Based on API 617 and API 618 standards. Used in gas gathering systems, gas injection, gas lift compression, and pipeline compression.

Heat Exchanger Design — LMTD and NTU-Effectiveness Methods

Shell and tube heat exchanger thermal design using LMTD (Log Mean Temperature Difference) and NTU-Effectiveness (Number of Transfer Units) methods. Calculate heat duty Q (kW and BTU/hr), overall heat transfer coefficient U, LMTD correction factor F, fouling resistance Rf, required heat transfer area A, number of transfer units NTU, heat exchanger effectiveness (0 to 1), outlet temperatures for both streams. Applicable to crude oil heaters, gas coolers, water-water exchangers, and process heat integration in oil and gas facilities.

Beam Pump and Sucker Rod Structural Design

API sucker rod pump (beam pump) structural analysis using Euler-Bernoulli beam theory. Calculates polished rod load (PRL), maximum and minimum load, gear reducer torque, counterbalance effect (CBE), structural unbalance, beam deflection (maximum and along span), bending stress distribution, shear force diagram and bending moment diagram. Applies to API beam pump units: C, M, A, B, Mark II geometries. Used for mechanical integrity verification, API unit selection, and gearbox torque analysis in sucker rod pumping operations.

Electrical Cable Sizing — ESP Motors and Surface Equipment

Electrical cable sizing for ESP/BES downhole motors and surface distribution. Calculates conductor cross-section (mm2 or AWG), voltage drop (%) along the cable, power loss (kW), operating temperature correction, cable resistance at depth, ampacity and current-carrying capacity. Standards: NEC (National Electrical Code), IEC 60364, API RP 11S. Accounts for derating factors: ambient temperature, grouping, installation method. Critical for ESP system design to ensure motor voltage within specification.

About The Engineer Tools

The Engineer Tools (theengineertools.com) is a free, open-access engineering platform created for petroleum engineers, production engineers, reservoir engineers, and mechanical engineers working in the oil and gas industry. All calculations are performed client-side in the browser using industry-standard correlations. Tools are available in English and Spanish (calculadoras en espanol para ingenieros de petroleo). Designed for use in Latin America (Peru, Mexico, Colombia, Venezuela, Brazil, Ecuador, Argentina) and worldwide. Free to use — no registration, no subscription required. Herramientas gratuitas de ingenieria de petroleo y gas. Calculadoras online de ingenieria mecanica. Perdidas por friccion en tuberias. Flujo multifasico. Simuladores de yacimientos. Ingenieria de produccion. Ingenieria de reservorios.